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BUY UC3853N https://www.utsource.net/itm/p/713974.html
Low voltage CMOS hex inverter with 5V tolerant inputs
The UC3853N is an integrated circuit that is used as a current-mode PWM controller. It is designed to provide improved performance and lower external parts count when used in off-line and DC-to-DC converter applications. It features a high-speed current-mode PWM control with a wide operating frequency range, low start-up current, and low operating current. The UC3853N also features an adjustable oscillator, an adjustable soft-start, and an adjustable current limit. The UC3853N is available in a DIP-8 package and is suitable for use in a variety of applications, including off-line and DC-to-DC converters, switch-mode power supplies, motor control, and lighting control. (For reference only)